Cold temperatures - Engine vibrations under light acceleration 1100-1200rpm

So I noticed when the temperatures drop, I can feel a very slight vibration from the engine when I really gently press on the accelerator. The vibration are only at 1000-1200rpm then its perfect. You would barely feel if you weren't focusing on it but it is there. This seems to go away once the car is warmed up. Is this a normal characteristic in colder climates? I cleaned my entire EGR system and intake manifold this summer and only started noticing this on colder days.

 

Did a full EGR and manifold cleaning this summer about 20k ago (Car is at 145k). No coolant lost what so ever. I just occasionally notice this tiny vibration at very lower rpms. I almost have to try to make it vibrate because anything above 1200rpm is smooth. This only happens when the car is cold.

 

Yes, I think I'm still getting used to the hybrid experience. It doesn't help my suspension is stiffer and I can feel the road imperfection more at low speeds. Just putting on my winter tires, I could immediately feel a difference at a lower speed which is sometimes hard to separate from this engine turning on vibration. I think I am just being paranoid and the engine kicking it with a low charge on cold days will be felt a little more.

 

I actually just changed it out so I will see if it makes a difference. It wasn't too dirty but not clean either. I reused when I did the EGR cleaning during the summer but now it's time to put my Denso replacement.

 

I made all that spotless already 20k ago. Took everything apart on the intake manifold and EGR system. For 130k it wasn't too dirty but those small ports in the intake we're starting to get obstructed.